Brush holder for commutators



July 21, 1925.

1,546,373 A. W. FARCUS ET AL BRUSH HOLDER FOR COMMUTATORS Filed Dec. 5,1924 2 Sheets-Sheet l J THEIR ATTORNEY July 21, 1925. "1,546,373

A. w. FARCUS ET AL BRUSH HOLDER FOR COMMUTATORS Filed Dec. 5. 1924 2Sheets-Shoot 2 INVENTORS W 1 TNESSES A WW6 W Daw'd T Jacobs 4% I l I r ITJI'EIR ATTORNEY Patented July 21, 1925.

UNITED STATES CAD PATENT OFFICE. i

ALEXANDER W. FABCUS AND DAVID '1. JACOBS, OF PHILADELPHIA, PENNSYLVANIA.

BRUSH HOLDER FOR COMMUTA'IORS.

Application filed December 5, 1924. Serial No. 754,048.

To aZZ whom it may concern:

Be it known that we, Aiinniimncn TV. FiincUs and DAVE) T. Jixoons,citizens of the United States, residing at Philadelphia, county ofPhiladelphia, and State of Penin sylvania, have invented certain new anduse ful Improvements in Brush Holders for Commutators, of which thefollowing is a specification.

Our invention relates tobrush holders for commutators and moreparticularly to those known as the open type which have minimum slidingsurface. l

The open type of commutator brush holder and brush is universally usedand accepted because dustand grit cannot accumulate to cause the brushto stick. The objection to this type is that'the rush is free to shiftand tilt sidewise so as to cause uneven wear on the brush and commutatorand thereby enhance the danger of the brush slipping out of position andcausing serious injury to the dynamo or motor.

Another objection. to this type is that when the commutator wears, thebrush depends so far from the holder that the friction between the brushand the commutator causes the brush to cant or tilt out of position,thereby causing short circuiting and burning of the electrical parts. Toreplace the brush holders with larger ones that extend to a point nearthe surface of the worn commutator so that the brush will not tilt outof position, is very costly.

The objects of our invention are to provide means on a brush holderwhich will prevent the brush from shifting or tilting sidewise, andwhich may be adjusted to the proper working position as the commutatorwears, thereby avoiding the uneven wear on the brush and commutator andthe costly replacement of brush holders.

These objects, and other advantageous ends which will be describedhereinafter, We attain in the following manner, reference being had tothe accompanying drawings in which Figure 1 is a vertical sectionthrough a brush holder having my invention applied thereto, certain ofthe parts being shown in full,

and a plate 8 mounted on the bracket for adjustment toward and from thecommutator. The plate 8 is rigidly held in adjusted position by teeth 9on the bracket meshing with corresponding teeth 9 on the plate andscrews 10 passing through slots 11, in the plate, into the bracket.Brush 4; slidably engages the outer face of the plate and is heldagainst the commutator by spring-pressed arm 6 engaging its upper face,and against sidewise tilting or shifting by a guiding rib 12 on theplate fitting within a groove 13 in the brush.

In operation, the guiding rib 12 will keep the brush in proper verticalalignment to cause even wear on the brush and commutator and thuslengthen the usefulness of the brush and the life of the commutator. Asthe commutator wears, plate 8 is adjusted toward the commutator as shownin Figure 2, and thus prevents the brush from being canted and slippedout of position by the friction between it and the commutator. Plate 8is adjusted by loosening screws 10 and bringing it down to the properposition so that the teeth on the plate will mesh with the teeth on thebracket, after which the screws are tightened to hold the plate inadjusted position.

When a brush holder and brush as above described are used, thepossibility of the brush getting out of proper alignment and slippingout of position is eliminated and the costly replacement by larger brushholders is avoided.

While we have described our invention as taking a articular term t wi beunder? a section on line of F igstood that the various parts may bechanged without departing fromthe spirit thereof, and hence we do notlimit ourselves'to the preciseconstruction set forth, but consider thatwe are at liberty to make such changes and alterations as fairly comewithin the scope ofthe appended claims.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent is 1. A brush holder for commutators hav ing abrush engaging face; a brush slidably engaging the face and thecommutator, and arib on the face for guiding the brush toward and fromthe commutator.

2. A brush holder for commutators having a brush engaging face; abru'shhaving a groove therein slidablyengaging the face i and thecommutator, and means on the face fitting within the groo e for guidingthe brush toward and from the commutator.

3. Abrush holder for commutators having a brush engaging face; a brushhaving a groove therein slidably' engaging the face and the commutator,and a rib on the face fitting within the groove for guiding the brushtoward and from'th'e commutator.

4L. A brush holder for commutators having a plate mounted: thereon foradjustment toward and from the commutator, and

a brush slidably engaging the plate and the commutator.

5. A. brush holder for commutators having an element mounted thereon foradjustment toward and from the commutator, and a brush slidably engagingthe element and the commutator.

6. A brush holder for commutators having a brush engaging elementmortised thereto and adapted to be adjusted from one mortised positionto another, means for holding the element in a mortised position, 7

-*bracket for holding the brush in position.

8. A brush holder for commutators hava brush engaging plate mortisedthereto and adapted to be adjusted fromone mortised position to another;mean'sfor holding the plate in a mortised position, and a brush slidablyengaging the plate and the commutator.

9. A brush holder for commutators having a brush engaging plate mountedthere? on for adjustment toward and from the com.- mutator; a brushslidably engaging the plate and the commutator, and means on the platefor guiding the brush toward. and from the commutator.

10. A brush holder for commutator-s having a brush engaging platemounted thereon for adjustment toward and-from the commutator; a brushslidably engaging the plate and the'commutator, and a rib on the platefor guiding the brushtoward and from the commutator.

In testimony whereof we have signed our names tothis specification inthe presence of two subscribing witnesses.

ALEXANDER N. FARCUS. DAVID T. JACOBS.

lVit-nesses:

liiLIZABETH GARKE, UHAS E. Por'rs.

